Issue #124, case 1: Added test for this case
Actual fix is in stx:libbasic, revision 3563e89f551b.
https://swing.fit.cvut.cz/projects/stx-jv/ticket/124#comment:19
/* XPM */
static char *ScrollDn2.xp_xpm[] = {
/* width height ncolors chars_per_pixel */
"15 15 10 1",
/* colors */
"a c #B0C0F0",
"b c #D0E0F0",
"c c #A0C0F0",
"d c #D0D0F0",
"e c #F0F0F0",
"f c #C0D0F0",
"g c #406080",
"h c #B0D0F0",
"i c #E0E0F0",
"j c none",
/* pixels */
"eeeeeeeeeeeeeee",
"eidffaaaaaaacbe",
"edffffaaaaaaaae",
"effffffaaaaaaae",
"effffaaaaaaaaae",
"ehffgaaaaagaaae",
"eafgggaaagggaae",
"eaaagggagggaaae",
"eaaaagggggaaaae",
"eaaaaagggaaaaae",
"ecaaaaagaaaaaae",
"ecaaaaaaaaaaaae",
"ecaaaaaaaaaaaae",
"ebaaaaaaaaaaabe",
"eeeeeeeeeeeeeee",
};